Extrusion machine



April 1930. B. M. TREBES 1,752,471

EXTRUSION MACHINE Filed May 24, 1924 s Sheets-Sheet 2 152%2227" Erm /M April 1930- B. M. A.'TREBES EXTRUSION MACHINE Fifi ed May 24,

1924 3 Sheets-Sheet 3 Patented Apr. 1, 1930 UNITED STATES PATENT OFFICE BRUNO. ALFRED TREBES, OF OAK PARK, ILLINOIS, .ASSIGNOR TO WESTERN {ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A. CORPORATION OI new YORK nx'rausron MACHINE Application filed May 24, 1924. Serial No. 715,650.

This. invention relates to extrusion maf:hines, and more particularly to pumps there- An object of this invention is to provide an 5 extrusion machine wherein improved .means ifs provided for controlling the output thererom.

Still another object of this invention is t provide an improved gear pump for extru- 1 sion machines in which the output may b varied without changing the speed of th gear or gears thereof. iv I In accordance with the preferred embodiment the invention contemplates the pro 15 vision of an extrusion machine wherein means is provided for causing the material to be extruded which may be effectively varied to control the amount of material extruded. Specifically, the invention embodies a gear pump an arrangement designed'primarily for extrusion machines wherein the elements throu h the instrumentalities of which the maternal is forced to the extrusion machine are made up of a plurality of laminations which may be fl fi'selectively operated to cause their engagement or disengagement with corresponding laminations to thereby vary the output of the pump without changing the speed of the means employed for imparting motive .pow-

- 30 er to the pump.

Other objects and advantages will more able keys 29 an 30, secured to a pin 31 which "rides in grooves 32 and 33 in the shaft 21.

fully appearfrom the following detailed description taken in connection with the accompanyin'g drawings which illustrate one em 35 bodiment thereof and in which,

Fig. 1 is a side elevation, artly in section, of an extrusion machine em odying the features of the invention, 7

Fig. 2 is a front view of the machine shown 49 in Fig. 1 showing a sectional view taken on the line 2-2 thereof and an elevation of the extruding head,

Fig. 3 1s a horizontal sectional view taken on the line 3-3 of Fig. 2, and

45 Fig. 4 is a vertical sectional view taken on the line 4-4 of Fig. 3 looking in the direction indicated by the arrows.

Referring now to the drawings in detail in which like reference numerals designate similar parts throughout the several views, de-

notes a frame which is of usual'construction. S'uitably mounted in the upperpart of the frame 10 are a pair of steam heated kneading rolls Man 12 (Fig. 1)' which may be revolved by anysuitable means (not shown). Positioned above the rolls 11 and 12 is a hopper 13 into which plastic material to be extruded is. fed. The plastic material, which may be rubber, gutta-percha or the like, is kneaded and forced by the rolls 11 and 12 into the intake chamber 14 leading to the gear pump, denoted generally by the reference character 15. Scrapers 16 and 17 embrace the surfaces of the rolls 11 and 12, respectively,

and are adapted to remove and direct any of the plastic material, which might adhere to the rolls 11 and 12, into the intake chamber 14.

The gear pump comprises essentially a casing '18 and two gears 19 and 20 rotatably mounted therein on shafts 21 and 22, respectively. Shaft 21 is adapted to be driven by any suitable source of power (not shown). The gear 19 is composed of three laminations or toothed disks 23, 24, and 25, and the gear 20 is composed of three similar laminations or tootheddisks 26, 27, and 28 which are loosely mounted on shaft 22,, the ends of which shaft are journaled in casing 18. The laminations 26, 27, and 28 are in mesh with the laminations 23, 24, and which are adapted to'be s lined to the shaft 21 by slidwith laminations 24 and 25, respectively,

locking them against rotation. Levers 39 and 40, pivotally'mounted on a pin 41 (Fig. 1.), suitably carried in arms 42 and 43 extending from the casing 18, are pivotally secured to the sectors 37 and-38, respectively, by ins 44 and 45, respectively.

The levers 39 and 40 are adapted to reciprocate the sectors 37 and 38 into and out of engagement with laminations 24 and 25 respectively, the said sectors riding in a slot 46 formed in the casing 18.

' It will be noted that only the laminations 2 1 and 25 of the gear 19 are adapted to be locked against rotation, the other lamination 23 being constantly splined to the shaft 21. Upon the application of power to the shaft 21, lamination 23 actuates lamination 26 of gear 20 and any other laminations of gear 19 which are keyed to the shaft 21 also function to actuate the associated laminations of gear 20 on shaft 22. Furthermore, by looking a lamination of gear 19, the associated lamination of gear 20, meshing therewith, is also locked against rotation. It is readily apparent, therefore, that the smallest volume of material which may be forced through by the pump 15 is that amount which one pair of laminations is adapted to force therethrough, inasmuch as lamination 23 is always splined to the power driven shaft 21. By actuating either of the levers 39 or 40, the toothed sectors 37 or 38 may be brought into engagement with laminations 24 or 25, respectively, which mesh with laminations 27 and 28, thereby enabling the locking of the said laminations against rotation.

By reciprocating the rod through the medium of the lever 36, laminations 24 and 25 may be disengaged from the shaft 21.- In

order to exemplify this more clearly, the drawings disclose lamination 24: as being splined to the shaft'21 by keys 29 and 30, and lamination 25 disengaged from the shaft 21 "and locked against rotation by the toothed sector 38. Furthermore, although the gears of the pump 15 are shown on the drawings as each being composed of only three laminat ons, it is to be understood that the inventlon is not to be thereby limited, but is to be restricted only by the scope of the appended claims.

The plastic material after it leaves the kneading rolls 11 and 12 (Figs. 1 and 2) is forced by the gear pump 15 into the extruding head 47 which is of any usual construction and then out around a cable core 48 passing through the said extruding head.

It. is believed that the operation of the mechanism is clearly apparent from the above detailed description.

The gear pump herein disclosed is particularly advantageous in cases where plastic material is to be extrudedas it enables the controlling and varying of the output of the mechanism in accordance with whatever rate of extrusion is desired, but it is to be understood that this gear pump, may be used with many other machines and for many other purposes without departing from the spirit and scope of the invention.

Then too, the speed of this gearpump need not be varied in order to change or control the output of the pump. this control being accomplished by selectively engaging or disengaging the laminations and thereafter lo'cking the disengaged laminations as has already been fully described. 1

What is claimed is:

1. In an extrusionmaehine, anextruding head, and a gear pump for forcing material through the said extruding head, the gear pump comprising a plurality of sets of elements, and means for Varying the relation of the elements of the respective sets for varying the output therefrom without changing the speed thereof.

2. In an extruslon machine, an extruding head, and-a gear pump for forcing material through the said extruding head, the gearpump comprising a pair of gears composed of a plurality of laminations,-means for selectively engaging or disengaging the laminations with or from each other, and means for locking the disengaged laminations.

5. In an extrusion machine, an extruding head, and a gear pump for forcing material from the said extruding head, the gear pump comprising a pair of gears in mesh with each other, composed of a plurality of laminations, means for selectively engaging or dis engaging the laminations with or from each other, means for locking the disengaged laminations, and means for rotating the gears.

6. In an extrusion machine, an'extruding head, and a gear pump for'forcing plastic material therethrough, comprising a pair of gears in mesh with each other, composed of a plurality of toothed disks, means-for selectively engaging or disengaging the disks with or from each'other, means for locking the disengaged disks, and means for rotating the gears. I

7. In an extrusion machine, an extruding head, and a gear pump for forcing plastic material therethrough, comprising a casing, a pair of gears rotatably mounted therein, meshing with each other, the gears being composed of a plurality of laminations, means for selectively engaging or disengaging the laminations with or from each other,

means forlocking the disengaged laminations, and means for rotating the gears.

8. In an extrusion mach1ne, a pair of kneading rolls, an extruding head, and a gear head, comprising a pair of gears, composed of a plurality of laminations, means for segears in mesh with each other, the gears being composed of a plurality of laminations.

10. In an extrusion machine, a pair of kneading rolls, an extruding head, and a ,gear pump, positioned intermediate said rollsandextruding head for forcing material supplied by the kneading rolls through the said extruding head, comprising a pair of gears in mesh With each other, the gears I being composed of a plurality of laminations,

means for selectively engagingor-disengaging the laminations With or from each other, means for locking the disengaged laminations', and means for rotating the gears.

In Witness whereof, I hereunto subscribe my name this 16th day. of May, A. D., 1924:.

BRUNO ALFRED TREBES. 

